This is one large set of disks to have in only 4u of space. And to top it off the thing has 4 cores. I love commodity hardware and sun has been rolling out some nice commodity hardware these days. The price for some of the equipment has started to catch my eye now. I think as far as initial interest this file server would be great if they just had ZFS working for linux. It looks like they are trying to port it with FUSE as a Google SOC project. If they get it going it would probably fit in well with XEN.